diff --git a/kleinanzeigen_bot/utils.py b/kleinanzeigen_bot/utils.py
index 424f374..ba30f06 100644
--- a/kleinanzeigen_bot/utils.py
+++ b/kleinanzeigen_bot/utils.py
@@ -4,7 +4,7 @@ SPDX-License-Identifier: AGPL-3.0-or-later
 """
 import copy, json, logging, os, secrets, sys, traceback, time
 from importlib.resources import read_text as get_resource_as_string
-from collections.abc import Iterable
+from collections.abc import Callable, Iterable
 from types import ModuleType
 from typing import Any, Final
 
@@ -15,13 +15,29 @@ LOG_ROOT:Final[logging.Logger] = logging.getLogger()
 LOG:Final[logging.Logger] = logging.getLogger("kleinanzeigen_bot.utils")
 
 
-def ensure(condition:bool, error_message:str) -> None:
+def ensure(condition:bool | Callable[[], bool], error_message:str, timeout:float = 5, poll_requency:float = 0.5) -> None:
     """
-    :raises AssertionError: if condition is False
+    :param timeout: timespan in seconds until when the condition must become `True`, default is 5 seconds
+    :param poll_requency: sleep interval between calls in seconds, default is 0.5 seconds
+    :raises AssertionError: if condition did not come `True` within given timespan
     """
-    if not condition:
+    if not isinstance(condition, Callable):
+        if condition:
+            return
         raise AssertionError(error_message)
 
+    if timeout < 0:
+        raise AssertionError("[timeout] must be >= 0")
+    if poll_requency < 0:
+        raise AssertionError("[poll_requency] must be >= 0")
+
+    start_at = time.time()
+    while not condition():
+        elapsed = time.time() - start_at
+        if elapsed >= timeout:
+            raise AssertionError(error_message)
+        time.sleep(poll_requency)
+
 
 def is_frozen() -> bool:
     """
diff --git a/tests/test_utils.py b/tests/test_utils.py
index ec8de0e..fa0c13f 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -3,9 +3,33 @@ Copyright (C) 2022 Sebastian Thomschke and contributors
 SPDX-License-Identifier: AGPL-3.0-or-later
 """
 import os, sys, time
+import pytest
 from kleinanzeigen_bot import utils
 
 
+def test_ensure():
+    utils.ensure(True, "TRUE")
+    utils.ensure("Some Value", "TRUE")
+    utils.ensure(123, "TRUE")
+    utils.ensure(-123, "TRUE")
+    utils.ensure(lambda: True, "TRUE")
+
+    with pytest.raises(AssertionError):
+        utils.ensure(False, "FALSE")
+
+    with pytest.raises(AssertionError):
+        utils.ensure(0, "FALSE")
+
+    with pytest.raises(AssertionError):
+        utils.ensure("", "FALSE")
+
+    with pytest.raises(AssertionError):
+        utils.ensure(None, "FALSE")
+
+    with pytest.raises(AssertionError):
+        utils.ensure(lambda: False, "FALSE", timeout = 2)
+
+
 def test_pause():
     start = time.time()
     utils.pause(100, 100)
@@ -13,4 +37,4 @@ def test_pause():
     if sys.platform == "darwin" and os.getenv("GITHUB_ACTIONS", "true") == "true":
         assert 99 < elapsed < 300
     else:
-        assert 99 < elapsed < 110
+        assert 99 < elapsed < 120